CVE-2025-9467: Vaadin Server Upload Validation Bypass Vulnerability
Summary
CVE-2025-9467: Vaadin Framework possible file bypass via upload validation on the server-side. Affects com.vaadin:vaadin-server across 2 version ranges.
>= 7.0.0, < 7.7.48
>= 8.0.0, < 8.28.2
Fixed in 7.7.48 or 8.28.2, depending on the release line you run. How to fix ↓
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Background
Vaadin is a popular Java framework for building modern web applications. The 'vaadin-server' package is a core component that handles server-side logic, including file uploads. It provides functionalities for managing user interactions and data processing. However, certain versions of this package are vulnerable to a bypass in upload validation, which can lead to unauthorized file uploads.
Vulnerability Detail
The vulnerability arises from the Vaadin Upload's start listener, which is intended to validate metadata about incoming uploads. In affected versions, it is possible to bypass this validation, allowing malicious users to upload files that should otherwise be restricted. This could lead to unauthorized access to sensitive data or the execution of harmful files on the server.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
-
>= 7.0.0, < 7.7.487.7.48 -
>= 8.0.0, < 8.28.28.28.2
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
As a temporary workaround, you may implement additional server-side checks to validate file types and sizes before processing uploads. This can help mitigate the risk until an upgrade can be performed.
Conclusion
The CVE-2025-9467 vulnerability in the Vaadin framework poses significant risks due to its ability to bypass upload validation. Users are strongly advised to upgrade to the latest patched versions to secure their applications against potential exploitation.
See every vulnerability recorded for com.vaadin:vaadin-server →
FAQ
CVE-2025-9467 is a vulnerability in the Vaadin framework that allows for bypassing upload validation, potentially leading to unauthorized file uploads.
Versions of 'vaadin-server' up to 7.7.47 and 8.28.1 are affected by this vulnerability.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Check your application's pom.xml file using the Vulert playground at Vulert Scanner.
The risks include unauthorized file uploads, which can lead to data breaches, server compromise, or execution of malicious code.
If an immediate upgrade is not possible, implement additional server-side validation checks as a temporary workaround to mitigate risks.
References
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